Title:
DELAY TIME DIFFERENCE CORRECTION DEVICE FOR SPACE DIVERSITY
Document Type and Number:
Japanese Patent JP2605628
Kind Code:
B2
Abstract:
PURPOSE: To correct the transmission delay time differences caused among plural diversity branches by the difference of lengths of RF feeders without using any correction feeder for a fading circuit which uses a space diversity antenna.
CONSTITUTION: A feeder correction circuit 110-1 uses the tap coefficient that is acquired when a delay time difference is corrected by an AMF(adaptive matching filter) 101-1. Then the circuit 110-1 applies the detection (115a-115c) to the acquired tap coefficient and decides the maximum value of the tap coefficient (116a-116c). Meanwhile plural routes (R-1, R0 and R+1) are set so that the different delayed variables are secured for the received signals. The route corresponding to the maximum value of the tap coefficient is selected and the received signals are transmitted through this selected route. Then the transmission delay time differences are eliminated among feeders by the transmission delays of those received signals.
Inventors:
Hideaki Sonoda
Application Number:
JP15549594A
Publication Date:
April 30, 1997
Filing Date:
June 15, 1994
Export Citation:
Assignee:
NEC
International Classes:
H01Q3/24; H04B7/08; (IPC1-7): H01Q3/24; H04B7/08
Domestic Patent References:
| JP6292503A | ||||
| JP56120202A |
Attorney, Agent or Firm:
Suzuki Akio